Dump car



Dec. 1, 1936. PEHRSON 2,062,526

DUMP CAR Filed Jan. 6, 1932 3 Sheets-Sheet 1 lNYENTO/l? JA ORNEY Dec. 1, 1936. -A. K. PEHR.SON 2,062,526

DDDDD AR Filed Jan. 6, 1932 5 Sheets-Sheet 2 Dec. 1, 1936.

A. K. PEHRSON I 2,062,526

DUMP CAR Filed Jan. 6, 1932 s Sheets-Sheet 3 /i/J AT RNEY Patented Dec. 1, 1936 UNITED STATES PATENT OFFICE DUMP CAR,

Application January 6, 1932, Serial No. 584,986

8 Claims.

My invention pertains to dump car body tilting mechanisms and particularly those mechanisms which include a fluid pressure actuated piston.

In the dump cars as now used on the railways and particularly the cars of larger capacity the car body in dumping pivots about trunnions mounted at the sides of the car. Under these conditions the maximum body tilting effort is required at the beginning of the dumping movement and the minimum of effort is required near the end of the dumping movement. The reasons for this will be apparent upon considering that when the car body is horizontal and in load carrymg position the center of gravity of the load and car body are farthest from the trunnions and as the body is tilted this moves nearer to the trunnions. Also the shifting of the load contained in the body assistsin the tilting of the body both by reason of resting upon the side th dumping mechanism. Fluid pressure actuated mechanism comprising a reciprocating piston contained within a cylinder mounted upon the underframe of the car are used on railway dump cars and the necessary length of piston to secure an eflicient dumping angle results in the need of large cylinders to contain such pistons. The excessive size of cylinders necessitates high mounting ofthe bodies and the long pistons are liable to'be distorted. ,To overcome these conditions various methods have been used among which is the method of employingtelescoping cylinders. In all of these methods, however, the mechanisms while using their full power to start thedumping of the body do not need such power a complete the dumping movement.

An object of the present invention is to take advantage of the decreasing amount of power necessary as the dumping proceeds and to interpose a suitable mechanism between the piston and car body whereby the car body is moved relative to the piston after the initial dumping movements thereby reducing the length of piston and stroke.

One method of accomplishing such object is disclosed in the following specification and appended drawings but it will be understood that the particular means employed are only illustrative and various equivalent means and modifications thereof will be apparent. to those skilled in the art. In the drawings the car body is shown resting upon the underframe and adapted to roll thereon until the trunnions engage and thereafter pivot thereon. This is a refinement of the invention as applied tocars supported upon the trunnions and adapted to pivot'upon such supports, but it will be apparent that the method disclosed in the drawings will be equally adaptable to either type.

No particular form of car body is disclosed as it will be understood that the invention can be used with any type of body of sufficient strength whether of the dropdoor type or lift door type. Likewise, the underfraine and power dumping mechanism can be of any type or form adaptable to the particular car desired. Should the car body be applied to 'a road vehicle and another type of power mechanism other than fluid pressure means be employed the invention can obviously be used.

In the drawings Fig.1 is a transverse section of a car embodying the invention with the car body in load carrying position. ,Fig; 2 is a transverse section of the car with the body in fully tilted position. Fig. 3' is a fragmentary view of the side elevation of a car showing the invention. Fig. 4

is a plan view of Fig. 3.

Referring in detail to the drawings, reference character I indicates a dump'car having a car body 2 supported upon an underframe 3 having the usual trucks 4. Spaced in pairs longitudinally of the underframe 3 are suitable members 5 to which are secured bearings 6 between which are mounted the cylinders l l of the fluid pressure actuated mechanism. Suitabletrunnions l 'aresecured adjacent the sides of the car body and adapted to be supported in bearings 8 secured to the underframe. The car body pivots about these trunnions on the bearings 8 during the major portion of the dumping movement. I I, V

.Interposed between the cylinder I I and'car body are the mechanisms for effecting the tilting of the car body and movement thereof relative .to the cylinder piston during the dumping movement. These mechanisms are mounted upon a yoke 9 secured to a reciprocating piston l0 mount ed within the cylinder II and comprise-a bell crank l2 pivotally mounted on. each end of the yoke with one arm thereof pivoted to the underframe 'at [6 and the other arm pivoted at I! to a member l3 secured to the body 2 by means of a bracket l4. Duplicate mechanisms are mounted on opposite sides of the car body when it is desired to have the body tiltable to either side of the underframe.

It will be observed that'in Fig.1 where the car body is shown in horizontal or load carrying position the bearing I5 of the bracket I4, by means of which the member I3 is connected to the car body, is a material distance below the upper limits of the cylinder and piston. The spacing of this bearing in the bracket I4 can obviously be varied to suit the particular conditions under which the car is to operate. shown in the drawings with a curved end portion. This member may or may not have this curved end portion depending on the conditions under which the mechanism is applied to the car. In this particular instance the curved portion serves the purpose of providing a clearance between the member I3 and cylinder when in the lower tilting position.

During the tilting of the body the action of the mechanism is as follows: the upward stroke of the piston and consequently yoke 9 causes rotation of the attached bell cranks I2 upon their connections I6 to the underframe which in turn causes the ends I! of the bell cranks to move transversely of the yoke and inwardly of the underframe of the car. This upward and inward movement of the ends I! of the bell cranks causes corresponding upward and inward movements of the members I3 secured thereto. The resultant movement of the members I3 effecting a vertical movement of the brackets I4 and consequently of the car body.

Referring to Figs. 1 and 2 of the drawings in which the car body is shown in horizontal and fully tilted positions respectively, it will be noted that in Fig. l the connection between the bracket I4 and member I3 is below the connection between the bell crank I2 and yoke 9. In Fig. 2 the positions are reversed indicating that during the upward stroke of the piston and consequently the arm of the bell crank secured to the yoke 9, the bracket I4 has moved a greater vertical distance than the piston so that there has been obtained an increased vertical movement of the body with relation to the piston than would have been possible had the piston been fixed to the car body.

The car body, during the tilting movements has pivoted about the trunnions on the side of the underframe opposite to the mechanism and the bell crank has pivoted about a point intermediate the sides of the underframe. This difference in the path of movements of the two pivoting parts is compensated for by the pivoting of the member I3 on the connections to the bracket I4 and bell crank I2. In this manner the member I3 remains as a tension member throughout the movement of the car body. Thus, the combined upward and inward movement of the end ll of the bell crank has resulted in an increased vertical travel of the end of the body adjacent the-piston than would have been possible had the piston been fixed to the car body. g

In cars of the type now mostly in use the discharge of the lading at the sides of the car is efiected by having the sides of the car comprised of doors pivotally mounted adjacent the floor of the body and acting as aprons to discharge the lading away from the car and by reason of their construction the shifting of the load onto these doors assists in the tilting of the car body. The conditions resulting therefrom may be such that the load on the door would tend to tilt the car body beyond the position shown in Fig. 2, which would cause the body to leave the underframe. To prevent this, a member I8 is provided which in the preferred form is a section of chain secured to the end of the lever I3 and to the car body to The member I3 is.

prevent movement of the car body beyond the position shown in Fig. 2 of the drawings.

At the descending side of the body the piston in the cylinder on that side of the car must have a limited downward movement in order that the various parts of the mechanism can adjust themselves to the position shown in Fig. 2. By referring to Fig. 3 of the drawings it will be noted that a suflicient clearance for this movement has been provided between the underside of the yoke 9 and cylinder II.

Referring now to Fig. 1 of the drawings where the car body is horizontal and considering power to be applied to the cylinder I I, the upward thrust of the cylinder 9 is applied to the car body through the member I3. Drawing the line A through the ends of the member I3, the turning moment applied to the body is the product of the force acting along the line A and the perpendicular distance from line A to the pivot point of the car body on the opposite side of the underframe. The capacity of the car body being known the size of cylinder to produce a suificient turning moment to tilt the car body can thus be computed.

As previously explained the effort required to tilt the car body becomes less after tilting begins and referring to Fig. 2 of the drawings, it will be seen that the turning moment there applied to the body is considerably less due to the decreased distance between the line A and the pivoting point of the body.

The cause of this reduction in the perpendicular distance of the line A from the pivoting point of the car body has been the changing of the position of the member I3 with relation to the car body. The resultant of such change has been a movement of the car body with relation to the cylinder piston so that for the same length of stroke of the piston the car body has moved a greater vertical distance or through a greater tilting angle than would have been possible had the piston been fixed to the car body.

From the above it will be apparent that in this manner by properly proportioning the various parts of the mechanism any desired movement can be obtained while retaining all the advantages of increased stability and strength resulting from a short piston travel and low height of car.

claim as new and desire to secure by Letters Patent is:

1. In a dump vehicle in combination, an underframe, a body tiltable about each side of the underframe on trunnions, a power source adjacent each side of the underframe, a lever mounted on the moving portion of each power source and fulcrumed on the underframe inwardly of said mounting, a depending bracket adjacent each side of'the body and having its lower extremities depending below the connection of the lever to the power source when the body is in horizontal position, and a member connected to the lower extremity of the bracket and to the free end of the lever.

2. In a dump vehicle in combination, an underframe, a body tiltable about one side thereof, a power source, including a movable portion, adjacent the opposite side of the underframe, a lever pivoted intermediate its ends upon said movable portion of the power source, a fulcrum for said lever upon the underframe, a member pivotally mounted upon the free end of said lever, a bracket depending from the body, one end of the mem- .50 Having thus described the invention, what I her being pivoted to the bracket in a position below its connection to the lever when the body is in horizontal position.

3. In a dump vehicle in combination, an underframe, a body tiltably mounted thereon, power actuated body tilting means adjacent a side of the underframe, a bell crank pivoted to the tilting means, a connection between one end of the bell crank and the underframe, a depending rigid member on the body, an arm having one end pivoted to said depending member, a link connection between the opposite end of the arm and the body, and a pivotal connection between the bell crank and arm intermediate the ends of the arm.

4. In a power actuated dump vehicle, in combination, an underframe, a body tiltably mounted on the underframe, a power source including a piston, a bell crank pivotally connected tothe piston and underframe and having a portion projecting outwardly of the connection to the piston, an arm pivotally mounted intermediate its ends on said outwardly projecting portion of the bell crank, a bracket depending from said body, a pivotal connection between one end of said arm and the bracket, and a member pivotally connected to the other end of said arm and to said body.

5. In a power actuated dump vehicle, in combination, an underframe, a body tiltably mounted thereon, a power source mounted on the underframe adjacent one side thereof beneath the body and including a piston, a bell crank pivoted intermediate its ends on the piston, a pivotal connection between the inner end of the bell crank and the underframe, a lever pivotally mounted intermediate its ends on the outer end of the bell crank, and vertically spaced operative connections between the ends of said lever and the body.

6. In a power actuated dump vehicle, in combination, an underframe, a body tilting about one side of the underframe, a power source mounted adjacent one side of the underframe, a piston in said power source movable towards the body, a yoke on said piston, a bell crank pivoted to each side of the yoke, a connection between one end of each bell crank and the underframe, spaced brackets depending from the body, an arm pivoted intermediate its ends to the free ends of each bell crank, a connection between one end of each arm and the adjacent bracket, a link connection between the other end of each arm and the body.

7. In a power actuated dump vehicle, in combination, an underframe, a body, means on the body and underframe providing selective tilting of the body to either side of the underframe, a power source adjacent each side of the underframe, a movable piston in each power source, a yoke mounted on each piston, a 'bell crank pivoted on each side of each yoke, connections between one end of each bell crank and the underframe, brackets depending from the body adjacent each side thereof, an arm pivotally mounted on each bell crank, and a connection between one end of each arm and the adjacent bracket below the connection between said arm and bell crank.

8. In a dump vehicle, in combination, an underframe, a body mounted on the underframe for tilting about one side thereof, a power actuated body tilting mechanism mounted adjacent the opposite side of the underframe, an upwardly moving piston in said mechanism, a bell crank pivotally connected with said piston, a pivotal connection between one arm of the bell crank and the underframe' inwardly of the piston, the other arm of the bell crank projecting outwardly of said un'd'erframe connection, a bracket depending from the body and below said other arm of the bell crank, and a member pivotally connected to said other arm of the bell crank and tosaid depending bracket'below said connection to the bell crank.

ALFRED K. PEHRSON. 

